<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="ipone.css">
</head>
<body>
    <div>
        <div>
            <b>
                <a href="" class="a1">1</a>
            </b>
            <b>
                <a href="" class="a2">4</a>
            </b>
            <b>
                <a href="">7</a>
            </b>
        </div>
        <div>
            <b>
                <a href="" class="a1">2</a>
            </b>
            <b>
                <a href="" class="a2">5</a>
            </b>
            <b>
                <a href="">8</a>
            </b>
        </div>
        <div>
            <b>
                <a href="" class="a1">3</a>
            </b>
            <b>
                <a href="" class="a2">6</a>
            </b>
            <b>
                <a href="">9</a>
            </b>
        </div>
    </div>
</body>
</html>